science optics test

Question 1

what is medium

Answer 1

any physical substance which energy can be transferred

Question 2

wavelengths

Question 3

electromagnetic wave

Answer 3

a wave that has both electric and magnetic parts

Question 4

electromagnetic spectrum

Answer 4

The complete range of all types of radiation that has both electric and magnetic fields and travels in waves

Question 5

visible light

Answer 5

the visible region of the electromagnetic spectrum

Question 6

visible spectrum

Answer 6

The continuous sequence of colours that make up white light

Question 7

incandescence

Answer 7

emitting light as a result of being heated

Question 8

electric discharge

Answer 8

The process of producing light by passing an electric current through a gas

Question 9

phosphorescence

Answer 9

The process of producing light by the absorption of UV light resulting in the emission of visible light over an extended period of time

Question 10

fluorescence

Answer 10

The immediate emission of visible light as a result of the absorption of UV light

Question 11

luminescence

Answer 11

the emission of light by a substance as a result of a chemical reaction

Question 12

chemiluminscence

Answer 12

The direct production of light as the result of a chemical reaction

Question 13

bioluminescence

Answer 13

The production of light in living organisms as a result of a chemical reaction (chemiluminescence in living organisms)

Question 14

light ray

Answer 14

a line and arrow on a diagram representing the direction and path that light is travelling

Question 15

incident light

Answer 15

light emitted from a sources that strikes an object

Question 16

transparent

Answer 16

when a material transmits all or almost all incident light; objects can be clearly seen through the material

Question 17

translucent

Answer 17

when a material transmits some incident light but absorbs or reflects the rest; objects are not seen clearly through the material

Question 18

opaque

Answer 18

when a material does not transmit any incident light; all incident light is either absorbed or reflected; objects behind the material cannot be seen at all

Question 19

image

Answer 19

reproduction of an original object through the use of light

Question 20

mirror

Answer 20

any polished surface reflecting an image

Question 21

reflection

Answer 21

the bouncing back of light from a surface

Question 22

plane

Answer 22

flat

Question 23

incident ray

Answer 23

the incoming ray that strikes a surface

Question 24

reflected ray

Answer 24

the ray that bounces off a reflective surface

Question 25

normal

Answer 25

the perpendicular line to a mirror surface

Question 26

perpendicular and parallel

Answer 26

perpendicular: at right angles parallel: lines that never meet

Question 27

angle of incidence

Answer 27

the angle between the incident ray and the normal

Question 28

angle of reflection

Answer 28

the angle between the reflected ray and the normal

Question 29

virtual image

Answer 29

an image formed by light coming from an apparent light source

Question 30

lateral inversion

Answer 30

the orientation of an image in a plane mirror that is backwards and in reverse order

Question 31

real image

Answer 31

the collection of focus points actually made by converging/diverging rays

Question 32

plane mirrors

Answer 32

a mirror with a flat reflective surface

Question 33

concave mirrors

Answer 33

a mirror shaped like part of the surface of a sphere in which the inner surface is reflective

Question 34

convex mirrors

Answer 34

a mirror shaped like part of the surface of a sphere in which the outer surface is reflective

Question 35

centre of curvature (c)

Answer 35

the centre of the sphere whose surface has been used to make the mirror

Question 36

principal axis

Answer 36

the line through the centre of curvature to the midpoint of the mirror

Question 37

vertex (V)

Answer 37

the point where the principal axis meets the mirror

Question 38

focus (F)

Answer 38

the point at which light rays parallel to the principal axis converge when they are reflected off a concave mirror

Question 39

angle of refraction

Answer 39

the angle between the refracted ray and the normal

Question 40

refracted ray

Question 41

coverage and diverge

Question 42

2 laws of reflection

Answer 42

1) The angle of incidence equals the angle of reflection 2) The incident ray, the reflected ray, and the normal all lie in the same plane